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On the Buy Volume and Sell Volume graphs, what is the difference between the blue lines and the red lines?
In left menu of a chart you are looking at, you will find an exchange with same color, for example:
You see red spike on buy volume chart.
By looking at left menu you know that "red" exchange is "Binance".
Then you hover tip of that spike and see a value (for example "20.2"), this value means how much of BTC somebody bought (sold in case of Sell volume chart ) at this moment of time.
(You will see USDT, which is a mistake... It displays value in BTC if you selected BTC/USDT pair...)